Stuart "Puffin" marine steam plant

A Stuart "Puffin" steam plant, a factory-built unit comprising a gas-fired horizontal boiler coupled to an oscillating twin engine with reverser valve.

One crankshaft has sustained damage at some point in the past and has been bent; currently seized, it will require dismantling and straightening before use

Designed for powering steam launches up to three feet long, there is further information and a full specification for the plant on the Stuart Models website.